NF T54-920-1997 Plastics piping systems Valves for polyethylene (PE) piping systems Test method for leaktightness under and after bending applied to the operating mechanism 《塑料管道系统.pdf

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ITU-R RAPPORT M 766-2 FRENCH-1990 Feasibility of frequency sharing between the GPS and other services《全球定位系统和其他服务之间的频率共享的可行性》.pdf

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